Canada and the US have issued further storm warnings a day after severe weather left dozens dead and brought travel in many areas to a halt.

Authorities have warned of further severe weather to hit the eastern Canadian provinces of Newfoundland and Labrador, New Brunswick and Nova Scotia.

The US National Weather Service said blizzard conditions were likely in Canada on Saturday and into Sunday.

It added: "A storm gathering strength in the eastern US is forecast to become a strong coastal winter storm for the North East this weekend."

It forecast more rain and snow in the mid-Atlantic region of the US, with New England among those expected to be worst hit.

Around 2,100 flights were grounded across the US on Friday

Stormy weather wrought chaos across the US east coast on Friday, with at least 25 people killed and hundreds of thousands of people left without power.

Among the victims was pregnant woman in New York who was killed after being struck by a snow plough. Her baby was later delivered by caesarean section and was said to be in a critical condition.

In North Carolina two people were killed when they tried to help a truck driver whose vehicle spun out of control on a snow-covered highway.

At least 30 people were injured in a series of multiple car pile-ups that shut down parts of a Pennsylvania highway. The accidents are believed to have involved up to 100 vehicles during the rush hour on Friday.

Motorists in Pennsylvania say roads were coated in ice

The storm, which first struck the US South on Wednesday, before moving north, pushed up into eastern Canada on Friday, bringing high wind and heavy snowfall to areas of Quebec and parts of Newfoundland.

A 200km (124-mile) section of the Trans-Canada Highway was closed in Quebec and many more highways were shut south of Quebec City.

The US is reported to be suffering one of the snowiest winters on record.

As of early this month, Washington, Detroit, Boston, Chicago, New York and St Louis had received up to three times as much snow as normal at this point in the season.

The storms and cold blasts are blamed in part on a kink in the jet stream, the high-altitude air currents that dictate weather.